CN210863789U - Improve CVT middling pressure tap and generate heat's voltage-sharing cap - Google Patents

Abstract

The utility model discloses a pressure-equalizing cap for improving the heating of a CVT medium-pressure tap, which comprises a connecting nut and a round cap hermetically connected with the connecting nut; the connecting nut and the round cap are both made of stainless steel. The connecting nut is a hexagonal nut, the hexagonal nut is provided with internal threads, the round cap is spherical, the round cap is hollow inside, the radius of the round cap is larger than the outer diameter of the hexagonal nut, the connecting nut is connected with the round cap in a welded mode, and the outer surface of the round cap and the outer surface of the hexagonal nut are smooth surfaces. The embodiment of the utility model provides a pair of improve CVT middling pressure and take a percentage the equal pressure cap that generates heat, take a percentage with the middling pressure through coupling nut and be connected, utilize the round cap to cover the middling pressure and take a percentage for the middling pressure is taken a percentage department and is showing with the vase difference in temperature and is dwindling, has played the guard action to the insulation of vase, has improved the security of equipment operation.

Description

Improve CVT middling pressure tap and generate heat's voltage-sharing cap

Technical Field

The utility model belongs to the technical field of the electric power safety, especially, relate to an improve CVT middling pressure and take a percentage the equipressure cap that generates heat.

Background

The lines and buses in the transformer substation are provided with capacitor voltage transformer equipment (CVT) which is used for converting high voltage into low-grade standard secondary voltage according to a certain proportion for the use of instrument devices such as protection, metering, measurement and the like.

As shown in fig. 1 and 2, it is a 220kV CVT outline.

The CVT is connected in parallel at a line outlet or a bus connection wire and is a voltage heating type device, and the CVT has the advantages of long service life and operation and maintenance of the CVT due to the fact that the CVT is small in heating value and low in temperature rise and the temperature difference of 3K can be judged to be a major defect.

The CVT medium voltage tap in the upper diagram is used for testing and is not grounded during normal operation. Because the metal tap directly passes through the porcelain insulator and is arranged in the air, the distribution of the surrounding electric field is uneven, and local heating is easily caused.

If a person on duty at a certain transformer substation patrols at night, the heating phenomenon is found at the middle-voltage tap position of the CVT in operation, the temperature difference between the heating point and the porcelain bottle is 20K, and the purple corona is observed at the middle-voltage tap position through a telescope.

Therefore, the prior art has the following problems:

the method comprises the following steps that firstly, if local heating faults of a medium-voltage tap are not processed in time, the insulation of a porcelain insulator can be degraded, and the porcelain insulator is subjected to a malignant event of insulation breakdown and grounding;

problem two, the local heating of middling pressure tap can influence fortune dimension personnel to the local deviation of the point that generates heat of vase, is unfavorable for discovering the inside defect of vase, and then brings very big hidden danger for equipment operation.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an improve CVT middling pressure and take a percentage voltage-sharing cap that generates heat to technical problem more than solving.

To achieve the purpose, the utility model adopts the following technical proposal:

a voltage-sharing cap for improving the heating of a CVT medium-voltage tap comprises a connecting nut and a round cap in sealing connection with the connecting nut.

As an optional technical scheme of the utility model, coupling nut and round cap are stainless steel material and make.

As an optional technical solution of the present invention, the connection nut is a hexagonal nut, and the hexagonal nut is provided with an internal thread.

As an optional technical scheme of the utility model, the round cap is globular, the inside cavity of round cap, the radius of round cap is greater than the external diameter of hexagon nut.

As an optional technical solution of the present invention, the connection nut is connected to the round cap by welding.

As an optional technical scheme of the utility model, the surface of round cap and the surface of hexagon nut are glossy surface.

Compared with the prior art, the embodiment of the utility model provides a following beneficial effect has:

the embodiment of the utility model provides a pair of improve CVT middling pressure and take a percentage the equal pressure cap that generates heat, take a percentage with the middling pressure through coupling nut and be connected, utilize the round cap to cover the middling pressure and take a percentage for the middling pressure is taken a percentage department and is showing with the vase difference in temperature and is dwindling, has played the guard action to the insulation of vase, has improved the security of equipment operation.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.

The structure, ratio, size and the like shown in the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention has no technical essential significance, and any structure modification, ratio relationship change or size adjustment should still fall within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy and the achievable purpose of the present invention.

Fig. 1 and fig. 2 are schematic diagrams of a 220kV CVT provided in the prior art.

Fig. 3 to fig. 5 are three views of a pressure equalizing cap for improving heat generation of a CVT middle pressure tap according to an embodiment of the present invention.

Illustration of the drawings:

the device comprises a ground terminal 2, a nameplate 3, a lifting flap 4, an oil filling plug 5, a capacitive voltage divider 6, a medium voltage tap 7, a window 8, a primary adjusting line segment box 9, an oil drain valve 10, a mounting frame 11, a secondary cable inlet 12, a secondary junction box 13 and a primary wiring board 14;

a connecting nut 21 and a round cap 22.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the embodiments of the present invention are clearly and completely described with reference to the drawings in the embodiments of the present invention, and obviously, the embodiments described below are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1 and 2, the prior art provides a 220kV CVT, which includes an electromagnetic unit (not shown), a ground terminal 2, a nameplate 3, a hanger 4, an oil plug 5, a capacitive voltage divider 6, a medium voltage tap 7, a window 8, a primary adjustment line box 9, an oil drain valve 10, a mounting frame 11, a secondary cable inlet 12, a secondary junction box 13, and a primary terminal block 14.

The CVT is connected in parallel at a line outlet or a bus connection wire and is a voltage heating type device, and the CVT has the advantages of long service life and operation and maintenance of the CVT due to the fact that the CVT is small in heating value and low in temperature rise and the temperature difference of 3K can be judged to be a major defect.

Referring to fig. 3 to 5, the present embodiment provides a voltage-sharing cap for improving the heat generation of the CVT middle pressure tap 7, which can uniformly distribute the electric field around the CVT middle pressure tap 7, reduce the discharging of the bolt tip, and thus improve the local over-heat generation of the middle pressure tap 7.

Wherein, the pressure equalizing cap comprises a connecting nut 21 and a round cap 22 which is connected with the connecting nut 21 in a sealing way.

Specifically, the connecting nut 21 and the round cap 22 are both made of stainless steel, so that the pressure equalizing cap has strong oxidation resistance.

As an alternative to this embodiment, the coupling nut 21 is a hexagonal nut provided with an internal thread. The voltage-sharing cap is simple to process, long in service life, free of frequent replacement and low in manufacturing cost.

Further, the round cap 22 is spherical, the interior of the round cap 22 is hollow, and the radius of the round cap 22 is larger than the outer diameter of the hexagonal nut.

As an alternative to this embodiment, the coupling nut 21 is welded to the circular cap 22.

Further, the outer surface of the round cap 22 and the outer surface of the hexagonal nut are smooth surfaces. The outer surfaces of the round cap 22 and the hexagonal nut are polished to be smooth through a polishing technology, so that the pressure equalizing capacity of the nut is good.

To sum up, the embodiment of the utility model provides a pair of improve CVT middling pressure and take a percentage 7 all pressure caps that generate heat takes a percentage 7 with the middling pressure through coupling nut 21 and is connected, utilizes cap 22 to cover middling pressure and takes a percentage 7 for the middling pressure is taken a percentage 7 and is showing with the vase difference in temperature and is dwindled, has played the guard action to the insulation of vase, has improved the security of equipment operation.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are intended to be inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed and illustrated, unless explicitly indicated as an order of performance. It should also be understood that additional or alternative steps may be employed.

When an element or layer is referred to as being "on" … … "," engaged with "… …", "connected to" or "coupled to" another element or layer, it can be directly on, engaged with, connected to or coupled to the other element or layer, or intervening elements or layers may also be present. In contrast, when an element or layer is referred to as being "directly on … …," "directly engaged with … …," "directly connected to" or "directly coupled to" another element or layer, there may be no intervening elements or layers present. Other words used to describe the relationship of elements should be interpreted in a similar manner (e.g., "between … …" and "directly between … …", "adjacent" and "directly adjacent", etc.). As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region or section from another element, component, region or section. Unless clearly indicated by the context, use of terms such as the terms "first," "second," and other numerical values herein does not imply a sequence or order. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

Spatially relative terms, such as "inner," "outer," "below," "… …," "lower," "above," "upper," and the like, may be used herein for ease of description to describe a relationship between one element or feature and one or more other elements or features as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the example term "below … …" can encompass both an orientation of facing upward and downward. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (1)

1. The pressure equalizing cap is characterized by comprising a connecting nut and a round cap in sealing connection with the connecting nut;

the connecting nut and the round cap are both made of stainless steel;

the connecting nut is a hexagonal nut which is provided with internal threads;

the round cap is spherical, the interior of the round cap is hollow, and the radius of the round cap is larger than the outer diameter of the hexagonal nut;

the connecting nut is welded with the round cap;

the outer surface of the round cap and the outer surface of the hexagonal nut are smooth surfaces.

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